How Can I Count Character Occurrences in a Python String?

Determining Character Occurrences in a String

Counting the number of times a specific character appears in a string is a common programming task. In Python, this can be accomplished using the str.count() method.

Solution:

The str.count() method takes three optional arguments:

• sub: The character or substring to search for.
• start: The starting index (from the beginning) to start the search.
• end: The ending index (from the beginning) to stop the search.

To count the occurrences of a character, simply call the count() method with the character as the argument. For example:

sentence = 'Mary had a little lamb'
char_count = sentence.count('a')

This code assigns the count of 'a' in the string to the variable char_count. The output is:

4

Additional Notes:

• The count() method is case-sensitive, so it will only match exact occurrences of the character.
• The start and end arguments allow for partial string searches. For example, the following code counts the number of 'a's in the first half of the string:

char_count = sentence.count('a', 0, len(sentence) // 2)

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